Chronic lateral ankle pain occurs most commonly from an improperly healed sprained ankle or other injuries.
Symptoms include recurring pain on the outside part of the ankle, ankle instability, difficulty walking on uneven ground, swelling, stiffness, and tenderness.
Treatments include over the counter or prescription medication, physical therapy to build muscle strength, steroid medications, ankle braces, and immobilization (in the case of fracture).
It is always important to seek the advice of a health care professional in cases like this. Continuous usage of an improperly healed body part can cause a tremendous amount of pain and problems.